Fluid-pressure brake apparatus.



W. V. TURNER.

FLUID 'PRESSURE BRAKE APPARATUS.

. APPL ICATION FILED MAY 18, I915- 1,241,582.

Patented Oct. 2, 1917.

2 SHEETS-SHEET I WITNESSES w. v. TURNER.

FLUID PRESSURE BRAKE APPARATUS.

APPLICATION FILED MAY 18, I915.

Patented Oct. 2, 1917.

2 SH EETSSHEET 2.

wrru'zsszs mvsmo 4.5 brake cylinder 21. r d

' Theeni'ergency port on may comprise an UNITE c rrier WALTER Vi TURNER,or Enenwoon, rENnsrL'vAiIIA, Ps ms-me e wasm'meg noose InBnAKE COMPANY,or WILMEBDING,QJZENINSYLVANIA, ACORPORATION OF PENNSYLVANIA. I

FLUID-PRESSURE BRAKE APPARATUS. p 2 my.

1 241,582. I Specific ation'of Letters Patent. Patented Oct, 2, 1917,

'To al'l whom may concern: V7 7 i 2 Be it known that I, W LTER V.Tonnes, a citizen of 'the'United States-,residing at Edgewood, in thecounty of Allegheny and State of Pennsylvania, have invented new anduseful Improvementsin Fluid-Pressure BrakeApparatus, of which thefollowing is a specification.

f This invention relates to fluid pressure brakes, and more particularlyto'a brake equipment adapted for securing a high b'raking power in.an-emergen'cy application of the brakes. v Theprincipal object,of-inyinvention is to I provide an improved-brake controlling valvedeviceadaptedto supply fluid to one brake cyl nder in a serviceapplication of the brakes" and to both the service brake cyl- I I-pipeelto equalizing piston chamber 2-and.

inder *andan emergency brake cylinder in an emergency application of thebrakes.

In the accompanying drawingsjFi-g'u'rle 1 is a' diagrammatic viewofi'a'car air brake equipment, embodying-"my invention, and

"Fig. 2 a central sectional view of the brake *-a0nae11in valve"device.-

The brake controlling valve. device may 'eom'prise, as shown in Fig. 20fthe draw- 111gs,aeasing '1' havingajpiston chamber 2 connected by apassage 3 with brake pipe 4 and containing an equalizing piston '5, saidpiston being ad'aptedto operate a main valve tand 'a gra'duating valve 7contained in valve chamber 8, connected passage 9 withapressure chamber10.

In addition :to the equalizing= portion,

there is provided an application portion and an emergency portion, theapplication portion comprising a piston 11 containedin'pi'ston cylinder12,"connectedi by, a passage 13 anapplication chamber 14, andadapted tooperate an application valve .15 contained {in valve chamber 16, and arelease valve '17,

contained in valve chamber 18, Whichis con- 19 and pipe '20 to servicenected by' passage and 25 and a slide valve 26 contained in valvechamber 27 and adapted to be operated by the ldifi'erential piston. Theemergency "portion also includes quick action valve J d c c mP gaPiston" c ed in J Y Application filedMay 18,1915; Serial No. 28,944.

piston chamber-29, and a" vent-valve 30,

contained in valve chamber 31, and adapted to'be operated by piston 28.i

According to my invention in an, emergencyapplication of the brakes,fluid is first vented from the brake'pip'e to the emergency brakecylinder and thon'frmn a "source'of' fluid underpressure,and for thispurpose a preferably comprises a differential piston '32, having thechamber 33 at the; small end, open to a'passage 3a and pipe 35 leadingto the emergency brake cylinder 36; LA supply'reservoir 37 isconnectedby pipe 38and a branched passage 39 to the application supplyvalve chamber 16 and emergency valve chamber 27.

In -operation, air flows from the brake thence through the usual reedgroove 4:0-to valve chamber '8, charging the pressure chamber I0 throughpassage 9.

Fluid also flows from valve chamber 8 'When asudden reduction in brakepipe pressure is made to eflejct an emergency applicationofj theibrakes,the piston 5 is shifted to emergency position, in which-the tailport 42registers with passage 43, Fluid isthen supplied from valv'echamb'erS'to appassage 19. i"

changeover v'al-ve device is provided which through a port 41 in slidevalve 6 and passage-39 t'o the supplyreservoir'37.

Normally, the piston chamber 25 is a "charged with fluid under pressureby ord1: nary leakage-from valve chamber 27 around the piston "head 23,but 'whe'n'the equalizing piston moves to emergency pos1tion,-passage-454s; coiinected' by cavity 46 withexhaust= assage l7. Fluid isthereuponvented from chamber 25 and the fluid pressure the piston actingin valve chamber 27 on the dlfl'erenemergency valve device to emergencyposition. i .In this position, passage a8 is opened-to valve chamber 27,so that fluid; is admitted from the supply reservoir t0 the'changc overvalve device 32."

tial area. of piston '23 operates to shift the A branched 49 leading toquick 3 action piston chamber 29 and to emergency quick action piston28which is then operated to open the vent valve 30. r

' I to flow through mssa e'sl, past vent valve 30, to the space a ovethe change over valve 32 and the change over valve is thereupon Iactuated toopen ajgport 52, leading to pasv brake pipe Fluidistonsequently: vented fron i the to the emergencybrake cylinder 36;;Upon -a 'predetermined 1 reduction in 1 brake pipe pressure'by flow totheemergency brake cylinder, the fiuidat supply reservoir pressure,acting on thedifferential, area of g o the changeover valve; 32, inconjunction With;thepressure'of spring-'53, operatesto shift the changeover valve to the upper position, closing; the port. 52 and connectingpassage 4L8 with. passage 342.1 Fluid from, I the supply reservoirf37;can I1OWflOW to the emergency reservoir until equalization takes"p-place. w

. ggivalve device to release position, in which the branched passage 4:9is connected by cavity To release the brakes, the brake pipep res- 'sureis increased so as to shift theequalizing 4 6,,xvith exhaustpassage 47.I

The passage 45 being nowblanked .by' the slide;valve 6,, fluid equalizestromyalve 1 chamber 27 into the emergency piston: chamber 25 through theusual leakage around piston 23 and since the'pis'ton chamber 24 is opento the atmosphere, the unbalancedpres sure acting on the-f emergencyvalve. device operates. tOi shift same i to release: position.

,1 T he" passage48 isgnoyv', connected by ;.cavity 54; with an exhaustpassage 55, so: that fluid from emergency brake y nder Sre: @l'ea-secl',v, V v I I 5 5; Passage stone-acted through; passage 43,p01-t 56, cavity,57 in the graduating I .valvefll and port oS vith cavity 46, so thatfluidis Nented fromf-the piston (cylinder 12 to the atmosphere and theapplication piston 50,11 is thereupon shifted to,; release position,

in which the service brake; cylinder 21 is ,connected to the exhaustthrough-a branched i has been closed by theupvvard movement of ,the;valye, a sma -ll equalizing vport maybe 60 1 prov ded which constantlyafilordsjcommunic'ation from said chamber to the brake indeiwpassage 34,v II II T Itvvill noW'be seen that a high braking gpoyver is'obtained inan emergency .applica- I I g3 tion of the brakes by firstventingfluidfrom a quick action valve} deviee operated upona vauxiliary valve 7I I Having now described'my invention, What I claim as nevvand desire tosecure byL et- 'ters Patent, vi s-z.

In order'to prevent 'mov'ernent' of the equalizing piston 5 to emergnt-y position upon a gradual reduction inbrake pipe pres- I sure afterthe pressure chamber has been reduced to 'thepressure in the brake pipe;This permitsfluid from the brake pipe 4;

'a reduction reservoir 61 is provided, which is connected bya passage 62and'a branch ,port 63; leading to service port Get With the valvechamber 8 and pressure chamber 10 Fluid isfthen. vented from theposition until-the pressure chamber equalizes into thereduCtionreservoir.

Quick recharge of the pressure chamber is effected by provlding apassagej65 ileadingfrom emergency check valvechamber 31 to the seatofslide valve 6 and adapted in release position to; register With port66 which; in .turn registers with I 1. In a fluid pressurevbrake, thecombination With a-br-ake'pipe, a serv ce brake. cylinder, and a valvemechanism operatednpon port 6.7 in-the so I a gradual reduction in:brake pipe pressure a .g:

for supplying ,fiuid to said .brakejcyli nder,

of an emergency brake cylinder and means operated m an emergeney applcation of the I brakes for first iventing fluid "front the brake pipe tothe eInergency brakegcylinder and thenirom a source offluidunderpressure.

2. In a I I fluid pressure brake, the combina tron. with a brake p pe,aserv1ce brake t-cyla; gradual reduction v in brake pipe pressure forsupplying fluid to said brake cylinder, of an emergenoybrakecylinder, areservo r normally charged vvithfluid underpressure, and means operatedupon anemergency ap- I; I ,pllcatlon of. the brakes for firstvent ng.fluid fromthe. brake pipe to said emergencybrake cylinder andithen fromsaid reservoir.

, Ina fluid pressurebrake, thecombinainder, and a valve mechanismoperated upoInQ- tion'ivitha brake pipe,.la servicerbrake cyli n'd er, areservoir normally charged Q'With I fluid under pressure, and ay'alvemechanism ,operatedupon a gradual reduction,illllorake pipe pressure forsupplying 'flui'dj semen reservoir to the brake cylinder, of,a-ner'nergency brake cylinder, andljme'ans' operative Quponasuddenfreductibn invbrakeipipe pres- ]sure' for first supplying fluidfrom the brake pipe to the emergencysbrake cylinderand "then.fr'omflsaid reservoir,

sudden reduction in brake pipe pressure for vventing fluid from thebrake pipe and a change over valve device operated by flow of fluidvented from the brake pipe for opening communication from the brake pipeto the emergency brake cylinder, said change over valve device beingoperated at a predetermined reduction in brake pipe pressure for openingcommunication from another source of fluid under pressure to theemergency brake cylinder.

5. In a fluid pressure brake, the combination with a brake pipe, aservice brake cylinder, an emergency brake cylinder, and a reservoirnormally'charged with fluid under pressure, of a quick action valvedevice operated upon a sudden reduction in brake pipe pressure forventing fluid from the brake pipe and a change over valve device subjecton one side to the flow of fluid vented from the brake pipe and on theopposite side to reservoir pressure for first opening communication forventing fluid from the brake pipe to the emergency brake cylinder andthen operating upon a predetermined reduction in brake pipe pressure foropening communication from the reservoir to the emergency brakecylinder.

In testimony whereof I have hereunto set my hand.

WALTER V. TURNER. Witnesses:

A. M. CLEMENTS, S. l/V. KEEFER.

(topics of this patent may be obtained for five cents each, byaddressing the Commissioner of Patents, Washington, D. G.

